Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/18690
If your custom sink doesn't have a "reporter", then I'm not sure how does
this code work in your changes? Since `MetricsSystem#report` will call report
API of each sink. I'm still not clearly sure about your scenario.
```
override def run(): Unit = {
metricsSystem.report()
}
```
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